FastVectorHighlighter Overlapping Queries Do Not Highlight [LUCENE-7593]

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Example Text:
ABCDEF

Example Query:
AB or ABC

I got two terms hit, (AB, startOffset=0, endOffset=2, weight=4), (ABC, startOffset=0, endOffset=3, weight=5), in FieldPhraseList's constructor, line 103, addIfNoOverlap, only (AB) were highlighted, and (ABC) with higher weight had been dropped because offset overlapping

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Migrated from LUCENE-7593 by Luo Ji, updated Mar 07 2018

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David Smiley (@dsmiley) (migrated from JIRA)

Hi Luo; thanks for reporting this problem. If you can supply a patch that fixes the problem with a test, I'd take a look.

I've been working on the UnifiedHighlighter (introduced in Lucene 6.3) and it doesn't suffer from this problem. Might you ascertain if the UH addresses your highlighting needs, and if not let me/us know what's needed?